Comprehensive understanding of SO3 effects on synergies among air pollution control devices in ultra-low emission power plants burning high-sulfur coal. (1st December 2019)

• Record Type: Journal Article
• Authors: Yang, Zhengda; Ji, Peidong; Li, Qingyi; Jiang, Ye; Zheng, Chenghang; Wang, Yi; Gao, Xiang; Lin, Riyi
• Is Part Of: Journal of cleaner production. Volume 239(2019)
• Publication Date: 2019-12-01
• Subjects: Air pollution control devices -- Ultra-low emission -- SO3 -- High-sulfur content coal -- Corona suppression; Factory and trade waste -- Management -- Periodicals; Manufactures -- Environmental aspects -- Periodicals; Déchets industriels -- Gestion -- Périodiques; Usines -- Aspect de l'environnement -- Périodiques; 628.5
• DOI: 10.1016/j.jclepro.2019.118096
• Languages: English
• ISSNs: 0959-6526

Abstract

Abstract: The environmental issue of SO3 pollution caused by coal-fired power plants attracts increasing attention. This work focused on the synergies between air pollution control devices in a 660 MW power plant burning high-sulfur coal. Parameters such as gas temperature and flow rate were varied within wide ranges under actual conditions. Both continuously tested SO3 concentration and on-line operational data were combined to establish a correlation between device performance and operational parameter. Results indicated that the gas temperature acted as a bridge of synergies between the electrostatic precipitator (ESP) and wet electrostatic precipitator (WESP). The SO3 removal efficiency across the ESP increased from 60.3% to 91.1% with the gas temperature decreasing from 136.7 to 114.8 °C, leading to the increase in corona current and the decrease in spark-over frequency of WESP. Moreover, additional electric field stages are also effective to enhance the corona current and reduce spark-over frequency. Furthermore, deviations between the design and operational data within 0–100% loading provided a correction to appropriately choose the gas velocity. With the proposed countermeasures, the SO3 emission can achieve a favorable level less than 5 mg/m 3 . The research findings provide a valuable technical pathway to eliminate the SO3 emission from power plants burning high-sulfur coal. Graphical abstract: Image 1092559 Highlights: A full-scale 660 MW power plant burning high-sulfur coal was investigated. SO3 effects on synergies among air pollution control devices were analyzed. The gas temperature acted as a bridge of synergies between the ESP and the WESP. Deviations were provided to guide the design and operation. SO3 emissions less than 5 mg/m 3 can be realized with synergetic methods.